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Four molecules of ags have speeds 1,2,3 ...

Four molecules of ags have speeds 1,2,3 and 4 `km//s`.The volue of the root mean square speed of the gas molecules is

A

`(1)/(2)sqrt(15)` km `s^(-1)`

B

`(1)/(2)sqrt(10)` km `s^(-1)`

C

2.5 km `s^(-1)`

D

`sqrt(15//2)` km `s^(-1)`

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